Apparatus for applying flat strips to corrugated paper



K. GREENE April 18, 1961 APPARATUS FOR APPLYING FLAT STRIPS TO CORRUGATED PAPER Filed Aug. 22, 1956 [22111232302 Ewmw 6: 2am,

APPARATUS FOR APPLYING FLAT STRIPS CORRUGATED PAPER Kermit Greene, Newton, Mass., assignor to Sherman Paper Products Corporation, Newton Upper Falls, Mass, a corporation of Massachusetts Filed Aug. 22, 1956, Ser. No. 665,651

7 1 Claim. 01. 1541.6)

" more, printing and labels cannot be satisfactorily applied to the corrugated side. These factors somewhat limit the utility of such blanks.

The principal object of this invention is to provide a means and method for producing corrugated blanks which are adaptable for handling by pneumatic pickups and lend themselves to printing or the application of labels, without materially increasing the cost of the blanks or affecting the appearance or physical characteristics.

According to the method here disclosed, a sheet of single-faced or unfaced corrugated paper, and one or more narrow strips of flat paper, are fed separately toward a heated roll around which they pass together. Just before the strips reach the roll, adhesive is applied to one side of each strip in a controlled quantity proportionate to the speed at which the strip is moving. The adhesive coated sides of the strips are pressed against the sheet and the adhesive is quickly dried by the heat of the roll. The sheet with the attached strips may then be cut into blanks in the usual manner, each blank having at least one piece of flat strip attached on the corrugated side.

The machine here described consists of the heated roll referred to above, appropriate feed and take-oil means for the corrugated sheet, one or more strip guides, a glue discharge nozzle disposed above each guide, a glue reservoir, and a pump and suitable piping connections for pumping glue from the reservoir to the nozzles at a controlled rate.

In the drawings illustrating the invention:

Fig. 1 is an isometric view of a machine for manufacturing corrugated blanks according to the invention, conventional parts of the machine being illustrated schematically;

Fig. 2 is a fragmentary plan view of the corrugated sheet as it emerges from the machine; and

Fig. 3 is an isometric view of a finished blank set up as a tray for bakery products.

The machine illustrated in Fig. 1 is equipped with a heated roll and a pair of guide rolls 11 and 12, guide rolls 13 and 14, and drive' rolls and 16. A continuous sheet 17 of single face corrugated paper is fed into the machine over roll 11, passes around roll 10, and then around roll 12, over roll 13, around roll 14 and between rolls 15 and 16 which are driven to draw the paper through the machine. The paper may be taken Patented Apr. 18, 1961 2 r from a storage roll mounted in any suitable manner,- or directly from a corrugating machine.

The strip applying mechanism is here illustrated as suitable for applying two narrow strips of flat paper 18 and 19 to the moving sheet. These strips are fed from reels 20 and 21, respectively. 1

Strip 18 passes under a roller 22 and then over a roller 23, both of which are mounted between edge guides 24 and 25. The latter are mounted on a fiat plate 26 which is supported in any convenient manner and has a forward edge 26a disposed adjacent and parallel to roll 10. The upper surface of this plate is preferably about even with the top of roll 10. Disposed between the forward portionsof guides 24 and 25, that is the lefthand portionsgas viewed in Fig. 2, is anozzle 27. Strip 18 passes under this nozzle, across plate 26, and around roll 10, where the strip becomes bonded to the sheet, and thereafter travels with the sheet.

Similarly, strip 19 passes from reel 21 under a roll 28 mounted between edge guides 30 and 31 at a rate proportionate to the speed of sheet 17 (and therefore of strips 18 and 19). The glue is deposited on the strips in continuous bands 44 and 45. Preferably nozzles 27 and 32, which are centered on the strips, are narrower than the strips, so that the bands of glue are deposited only along the central portion of the strips. This prevents spreading of the glue beyond the edges of the strips when the latter are bonded to sheet 17. For example, for a strip three-quarters of an inch wide, a nozzle width of five-eighths of an inch is satisfactory.

The glue coated strips, as they pass around roll 10, are pressed against the corrugated side of sheet 17 and at the same time the glue is substantially dried by the heat of the roll. Thereafter the strips adhere to sheet 17 and travel with the sheet over idler rolls 13 and 14 to the driving rolls 15 and 16. The sheet may then pass to any suitable mechanism for cutting it into blanks, for example to a slitter 46.

Adhesive is continuously fed to nozzles 27 and 32 through discharge conduits 33 and 34 to which the nozzles are respectively connected. These conduits are connected to the discharge side of a rotary pump 35 which may be of any suitable conventional type. An intake conduit 38 is connected to the intake side of the pump and to a reservoir 39, in which a quantity of adhesive is stored and which is mounted above the pump. A pair of by-pass lines 40 and 41 are connected to conduits 33 and 34, respectively, and lead back to the reservoir to relieve the pump in case of sudden changes in its speed, especially in starting.

The pump is driven by a belt and pulley assembly 42, from roll 11, and isthus driven at all times at a speed proportionate to that of the paper 17. The rate of discharge of adhesive through nozzles 27 and 32 is, therefore, proportionate to the speed of travel of the paper.

A typical set-up blank 50 is illustrated in Fig. 3. a This blank is cut to half the width of the sheet and carries a single strip 51 on its corrugated side. The ends 50a and 50b of the blank have been bent up to form a U- boar suitable, for example, for packaging muifins or cup cakes. The strip 51 which is disposed on the outside bottom of the finished tray furnishes a flat area on of applying the glue, and the proportioning control, in

sures uniform application and eliminates waste of glue or smearing of the exposed corrugated surfaces on either a ide of'thestrip. 1

What is claimed is: x w A A machinefbr attaching flat paper strips to a corrugated sheet of paper,- cbmprising an' extruding nozzle','- a reservoir for adhesive," a pump connected'so 'as'to pump adhesive from said reservoir to said'nozzle;'a roll, means for continuously drivinga strip'past said nozzle and around said roll edge guides spaced by substantially the width of the strip andadapted to engage a strip as it passes under said 'nozzle,'said nozzlebeing narrower than the spacebetween the edge guidesan'd centrally disposed with respect to the' guides, means for continuously driving a 'corrugatedsheet around-said roll alongwith 'said strip, and 'means for driving said'pump' ati'a spe'ed proportionate to that of the sheet'andstrip around said roll.

assuage References Cited in the fileof this patent UNITED STATES PATENTS 345,236 Jordan July 6, 1886 1,770,757 July 15, 1930 2,107,748 Cohn Feb. 8, 1938 2,505,404 Jacobsen Apr. 25, 1950 2,519,102 Bergstein Aug. 15, 1950 2,542,623 Cahen Feb. 20, 1951 2,562,641 Saunders July 31, 1951 2,588,580 Scruggs Mar. 11, 1952 2,599,604 Bauer et a1. June ,10, 1952 2,662,577 Gordon Dec. 15, 1953 2,775,952 Schur; Jan. 1, 1957 2,829,701 Keely Apr. 8, 1958 2,914,108 Coakley Nov; 24, 1959 

